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Sewage treatment plant, major discharger, Grafton, Wisconsin. NPDES permit WI0020184 expired Dec 31, 2025; its limits still apply. Last 12 months: no values over a limit, 9 required values missing, 2 of 26 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Nitrogen, total [as N] | quarterly maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | quarterly maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | quarterly maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 001 |
| Mercury, total recoverable | annual maximum | report only (ng/L) | all year | 001 |
| Mercury, total recoverable | annual maximum | report only (ng/L) | all year | 107 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 701 |
| BOD, 5-day, 20 deg. C | monthly maximum | report only (mg/L) | all year | 701 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 701 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | 701 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 701 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | 701 |
| Mercury, total recoverable | annual maximum | report only (ng/L) | all year | 701 |
Cited limits by parameter: Wisconsin's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/WI0020184 · MCP: https://passage-data.com/mcp